\begin{tabular}{lcccc} \hline
 & (1) & (2) & (3) & (4) \\
VARIABLES & ASC OLS & ASC IV & ASC OLS & ASC IV \\ \hline
 &  &  &  &  \\
High $\Delta$ IPW (91-07) & 0.070*** & 0.097*** &  &  \\
 & (0.026) & (0.037) &  &  \\
$\Delta$ IPW (91-07) &  &  & 29.784** & 27.207** \\
 &  &  & (12.839) & (11.840) \\
Female & 0.028 & 0.027 & 0.028 & 0.028 \\
 & (0.028) & (0.028) & (0.029) & (0.028) \\
Age & 0.005*** & 0.005*** & 0.005*** & 0.005*** \\
 & (0.001) & (0.001) & (0.001) & (0.001) \\
Higher Cert. & -0.104*** & -0.103*** & -0.105*** & -0.105*** \\
 & (0.039) & (0.038) & (0.039) & (0.039) \\
University & -0.235*** & -0.235*** & -0.234*** & -0.235*** \\
 & (0.031) & (0.031) & (0.031) & (0.031) \\
Married & 0.104*** & 0.105*** & 0.104*** & 0.104*** \\
 & (0.024) & (0.024) & (0.024) & (0.024) \\
\% non-UK born & -0.001 & 0.000 & -0.001 & -0.001 \\
 & (0.002) & (0.002) & (0.002) & (0.001) \\
$\Delta$ \% non-UK born & 0.002 & 0.001 & 0.002 & 0.002 \\
 & (0.002) & (0.002) & (0.002) & (0.002) \\
 &  &  &  &  \\
Observations & 1,793 & 1,793 & 1,793 & 1,793 \\
R-squared & 0.128 & 0.128 & 0.127 & 0.127 \\
 TTWAs & 239 & 239 & 239 & 239 \\ \hline
\multicolumn{5}{c}{ Robust standard errors in parentheses} \\
\multicolumn{5}{c}{ *** p$<$0.01, ** p$<$0.05, * p$<$0.1} \\
\end{tabular}
